Abstract
Fulvic acid (Henan ChangSheng Corporation) photoinduced degradation of non-UVA-absorbing herbicide amitrole (3-amino-1,2,4-triazole, AMT) as a way for its removal from polluted water was investigated in details. It was shown that the main primary species generated by fulvic acid under UVA radiation, triplet state and hydrated electron, are not directly involved in the herbicide degradation. AMT decays in reactions with secondary intermediates, reactive oxygen species, formed in reactions of the primary ones with dissolved oxygen. Singlet oxygen is responsible for 80% of herbicide oxidation, and •OH and O2 −• radicals—for the remaining 20% of AMT. It was found that quantum yield of AMT photodegradation (ϕ 365nm) decreases linearly from 2.2 × 10−3 to 1.2 × 10−3 with the increase of fulvic acid concentration from 1.1 to 30 mg L−1. On the contrary, the increase of AMT concentration from 0.8 to 25 mg L−1 leads to practically linear growth of ϕ 365nm value from 1.8 × 10−4 to 4 × 10−3. Thus, the fulvic acid exhibits a good potential as UVA photooxidizer of organic pollutants sensitive to the singlet oxygen (ϕ 532nm(1O2) = 0.025 at pH 6.5).
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Acknowledgements
The work was financially supported by the Russian Foundation for Basic Research (grants no. 15-03-03376, 14-03-00692) and by Belorussian Republican Foundation for Fundamental Research (joint with SB RAS project BRFFR-SB RAS no. F15SО-036). HPLC analyses were performed with the financial support from the Grant Council of President of RF (MK-1515.2017.3).
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Pozdnyakov, I.P., Sherin, P.S., Salomatova, V.A. et al. Photooxidation of herbicide amitrole in the presence of fulvic acid. Environ Sci Pollut Res 25, 20320–20327 (2018). https://doi.org/10.1007/s11356-017-8580-x
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DOI: https://doi.org/10.1007/s11356-017-8580-x